(C) Hydrochloric acid $(HCl)$ is a strong acid and dissociates completely in water.$HCl \rightarrow H^{+} + Cl^{-}$Therefore,the concentration of hydr

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(C) Hydrochloric acid $(HCl)$ is a strong acid and dissociates completely in water.$HCl \rightarrow H^{+} + Cl^{-}$Therefore,the concentration of hydrogen ions is $[H^{+}] = 10^{-3} \ M$.The formula for $pH$ is $pH = -\log[H^{+}]$.Substituting the value: $pH = -\log(10^{-3}) = 3$.Thus,the correct option is $(C)$.